java的frush功能_IO中flush()函数的使用代码示例
The java.io.Writer.flush() method flushes the stream. If the stream has saved any characters from the various write() methods in a buffer, write them immediately to their intended destination. Then, if that destination is another character or byte stream, flush it. Thus one flush() invocation will flush all the buffers in a chain of Writers and OutputStreams.
public class Demo {
public static void main(String[] ars) throws Exception {
System.out.println("hello");
PrintWriter writer = new PrintWriter(System.out);
writer.println("writer start");
// writer.flush();
try {
Thread.sleep(3000);
}
catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
writer.println("writer close");
writer.close();
}
}
如上面代码，如果flush()被注释掉，则打印完“hello”之后3秒才会打印”writer start”，”writer close”，因为writer.close()在关闭输出流前会调用一次flush()。效果如下：
如果flush()没有被注释掉，则则打印完“hello”之后会立即打印”writer start”。
总结
以上就是本文关于IO中flush()函数的使用代码示例的全部内容，希望对大家有所帮助。感兴趣的朋友可以继续参阅本站其他相关专题，如有不足之处，欢迎留言指出。感谢朋友们对本站的支持！
The java.io.Writer.flush() method flushes the stream. If the stream has saved any characters from the various write() methods in a buffer, write them immediately to their intended destination. Then, if that destination is another character or byte stream, flush it. Thus one flush() invocation will flush all the buffers in a chain of Writers and OutputStreams. public class Demo { public static void main(String[] ars) throws Exception { System.out.println("hello"); PrintWriter writer = new PrintWriter(System.out); writer.println("writer start"); // writer.flush(); try { Thread.sleep(3000); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } writer.println("writer close"); writer.close(); } } 如上面代码，如果flush()被注释掉，则打印完“hello”之后3秒才会打印”writer start”，”writer close”，因为writer.close()在关闭输出流前会调用一次flush()。效果如下： 如果flush()没有被注释掉，则则打印完“hello”之后会立即打印”writer start”。 总结 以上就是本文关于IO中flush()函数的使用代码示例的全部内容，希望对大家有所帮助。感兴趣的朋友可以继续参阅本站其他相关专题，如有不足之处，欢迎留言指出。感谢朋友们对本站的支持！